There's a big magical place out there, I've heard whispers of it being called the 'interwebs'.
Rumor has it, there's actually a GUIDE to this massive interwebs. It has been entitled 'Google'.
Ask, and ye shall receive.
You'd think that going onto a community forum that you'd receive help, and not sarcasm.. I've already looked online. I was merely checking on other people's experiences of maybe if they had pass knowledge of an unknown shop or something online that I could find one of the two items I am seeking.
Well, You could search around in phone books or the internet for Japanese anime Shops.
Theres one in my city, Its really good, I live in Australia and they always have American DS Games there (Witch do work on the Australian DS's) Theres Manga, Plushies and Figures. Really Good Shop Glad I found it, and they once had a mudkip plushie there but it was bought the next day lol.
Auction sites are usually your best bet. I did a search myself and could not find much in the way of Mudkip Plushies except a few pictures. I think Mudkip may be popular which may explain the lack of people giving them up or having any more to sell. Mudkip Plushies could have sold out like crazy. Unfortunately, this thread could cause newbies to post links to various auctions (and I know they will, because they usually do) and I can't take any chances. I believe your problem has been addressed with enough detail. I hope you find the Mudkip Plushie you are looking for.