Previews and Commercials
At the end of all Hamtaro episodes he appear with a little talk about what will happen next episode, right? Wouldn't be great to get that little part of the episode separated? Here you get it! The following are courtesy of TK:

Ep 2 - The Ham-Ham Clubhouse (Unavailable)
English - Raw - Provided by TK

Ep 12 - Bijou is in Danger
Portuguese - Raw - Provided by TK

Ep 13 - Let's Dance, Sandy (Unavailable)
Portuguese - Raw - Provided by TK

Ep 14 - The Search for Sandy's Brother (Unavailable)
Portuguese - Raw - Provided by TK

Ep 15 - Bijou's Favorite Ribbon (Unavailable)
Portuguese - Raw - Provided by TK

Ep 207 (Unavailable)
Japanese - Raw - Provided by TK

Ep 207 (Unavailable)
Japanese - Subbed - Provided by TK

Ep 209 (Unavailable)
Japanese - Raw - Provided by TK

Ep 209 (Unavailable)
Japanese - Subbed - Provided by TK

Ep 229 (Unavailable)
Japanese - Raw - Provided by TK

Ep 229 (Unavailable)
Japanese - Subbed - Provided by TK

Ep 295 (Unavailable)
Japanese - Raw - Provided by TK

Ep 296 (Unavailable)
Japanese - Raw - Provided by TK

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Also here you can find a few commercials and trailers ripped from Youtube by TK. They're in different languages:

Adventures in Ham-Ham Land Trailer
Ham-Ham Games Trailer
Ham-Ham Games Trailer 2
Ham-Ham Heartbreak Trailer
Ham-Hams Unite Trailer
Hamtaro Rainbow Rescue Trailer
Nazo Nazo Q Commercial *AVI by Zuo Ci
TVB Commercial (Unavailable)
KFC Commercial (Unavailable)

These commercials were ripped from Japanese television episodes by Doggy - sorry for part of episodes in some of them:

Let's go to school
Hamtaro Rainbow Rescue commercial
Play Clubhouse commercial
Ham-Ham Clubhouse commercial
Ham-Ham Circus commercial
Hamtaro Food commercial (Unavailable)
Hamtaro McDonalds commercial

This commercial was donated by Sunny:

English Halloween episode commercial (Unavailable)
Kristopher donated some commercials and promos in different languages:

Hamtaro Toonami Intro
Hamtaro Cartoon Network Promo
Hamtaro First Promo)
Hamtaro Long Promo
Hamtaro Longer Promo
Hamtaro Burger King Halloween Commercial
Hamtaro Rare Cartoon Network Promos (includes ad for birthday special)
English - Ham-Ham Dance Commercial
English - Hamtaro iOS app teaser
English - Hamtaro iOS app promo
English - Ham-Ham Heartbreak Commercial
English - Hamtaro and Transformers McDonald's Happy Meal Commercial
Spanish (Mexico) - Hamtaro New Episodes Promo
Spanish (Mexico) - Hamtaro Cartoon Network Latinoamerica Promo
Spanish (Spain) - Hamtaro Disney Channel Promo 1
Spanish (Spain) - Hamtaro Disney Channel Promo 2
Spanish (Spain) - Hamtaro Disney Channel Promo 3
Arabic - Hamtaro Spacetoon Promo
Arabic - Hamtaro Spacetoon Showtimes Promo
Arabic - Hamtaro Spacetoon New Showtimes 2015 Promo
Arabic - Hamtaro Spacetoon 'After a bit' Promo
Arabic - Hamtaro Choco Cereal Ad
Arabic - Hamtaro Gum Ad
Arabic - Hamtaro Chocolate Egg Ad
Arabic - Hamtaro Ham-Ham Home Ad
Arabic - Hamtaro Small House Ad
Filipino - TV5 Hamtaro Promo
Mandarin - KIDS TV Promo
Mandarin - New episodes Promo
Mandarin - Commercial 1
Mandarin - Commercial 2
Mandarin - Movie 1 Promo
Mandarin - Hamtaro 10th Anniversary Promo
Mandarin - Paradichu Commercial
Italian - Paradichu Commercial 2
Italian - Hamtaro on channel Frisbee Commercial
Italian - Hamtaro OVA Promo
Italian - Hiro - The Next Level Promo
Dutch - DVD ad
Japanese - Hamtaro in Ciao! magazine ad
Japanese - Hamtaro clothing ad
Japanese - Playset and Toys ad
Japanese - Sunrise Tottoko Hamutaro Hamster Breakfast Series commercial
Japanese - Tottoko Hamutaro Music Pod commercial
Japanese - McDonald's Happy Set Tottoko Hamutaro commercial
Japanese - Tottoko Hamutaro Stationery commercial
Japanese - Early ad for 1st Hamtaro movie
Japanese - Movie 3 Promo
Japanese - Ham-Ham Heartbreak Long Trailer
Japanese - Dechu promo
Maxtaro donated some Japanese natural gas company commercials:

Shizuoka Gas Hamtaro Ad #1
Shizuoka Gas Hamtaro Ad #2
Shizuoka Gas Hamtaro Ad #3
Shizuoka Gas Hamtaro Ad #4