Oh dear lord, ever since i got my super everdrive, i just realized that making repros nowadays is pretty much futile and a bit of a waste, since you know, the games you need to sacrifice them boards are now artificially inflated as all hell and you cant get them anymore for dirt cheap or even reasonable anymore because even the brick & mortar/goodwill like stores have succumbed to the temptation (and betrayed what they used to stand for in the first place) and suck on the giant Ebay/Speculator/Scalper/Extorsionist wee wee.
Not to mentions, most people sun the making of repros for legit rare titles like Bubble Bobble 2, Little Samsom and Suprise at Dinasour Peak, sure, because paying fortunes to get these titles legally is not illegal
Now, i now about these
http://www.infiniteneslives.com/nessupplies.php
but then again, these are in case YOU know how to make repros yourself, like, it's not like you can actually tell the repro maker to get you one of these. (damn shame, because IinfiniteLives even has cart shells!, remember when retroUSB use to do them?).
And finally, the EPROM issue, i heard that genesis and SNES repros use FLASH ROMs to make them and they last longer (correct me if i am wrong).
and for me, it's the racism of shipping fees from the US post
Also i got screwed over because of my own postal service, because i actually bought a repro once from Leon, the guy behind nesreproductions.com, and the game in question was sweet Home, and yes, i sacrificed my original Zelda II for it, and then he told me that he needed to convert the board or something to the one from Zelda 1, since Zelda II wasn't compatible, i pay the price and he told me he couldn't get the tracking option from Canada, since they asked $60 USD he told me, well, i got fucked, because my postal service "lost" the package and for a 3 months i got nothing and i complain to my postal service and nada, and they also didn't gave me any confidence either, (that's why i say FUCK IT and just went trough my unaltered Sweet Home untranslated in famicom form), now, i wish no ill towards Leon, because he was nice and refund me my money, but i deeply regret this experience, since i lost Zelda II.