Are you sure about that? As I recall the main reason DSi Enhanced games didn't work with it was because they were not dumped correctly early on. The iEvo expects the roms to have encrypted modcrypt sections and encrypted secure areas I think and all the rom dumpers I know of dump them with that stuff decrypted as well as all the "scene" dumps you find in illecit sites.
Though as long as you have a relatively modern dumper like GodMode9 on 3DS or wooddumper_r89, you can get valid dumps. You'll just have to re-encrypt NTR and TWL secure areas (I tend to call the TWL secure area modcrypt, but the terms cover the same thing basically.
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That was the main thing the iEvo was picky about. I think the issue was that it's compatibility with NTR only games while in DSi mode was spotty and that might be what you remembered bad about it. But it has a setting for switching it into DS mode. My DSi has hax installed and I already downgraded it to 1.4. I can even modify the DS Cart white list to white list a custom icon for it should I ever figure out how to flash a custom icon to it for the NTR mode rom it uses.
(FYI, 1.4 System Menu did not have RSA checks for the DS Cart White list file, so you can do what ever you want to that file pretty much.
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I know a site that sells the iEvo for around $40. Same place I got my DS-Xtreme too. Kinda don't want to reveal where because I don't want them to be sold out when the 3rd of June rolls around when I finally will pick one up.