there is an abundance of generation 1 soundwave reissues of late

There are

Encore
Classics
Takara Book Style Reissues
the upcoming SDCC reissue

all will fit the tapes, and come with atleat one tape each (the sdcc one comes with 4 )

As for avaliability, best chances are for encore or classics, because the takara book style one can go for 100aud at least (i paid 100aud for my soundblaster last week)

The SDCC reissue may hit retail here, but is unlikely, so your best options are either ebay, or online shops such as toy-wave.com or robotkingdom.com etal