http://shop.01media.com/brand.asp?ID=434
Apparently still has some lite deluxes and some lites (do not buy one of the lite compacts). Far cheaper than that previous link with stock as well, still not cheap but if this is money no object then who cares really. The lite deluxe is even better than the other EZ4 models as it has 256MBit of PSRAM (enough for every dumped GBA game, granted not much goes above 128Mbit which is the original and lite EZ4 RAM size) and 384 MBit of NOR (48 megs, enough for a few games) compared to the original and lite's 256Mbit (will hold the biggest GBA game and not a lot else or a handful of smaller games).
They use microSD (and only microSD -- if it is above 2 gigs in size consider it SDHC) though such things are far easier to source than miniSD these days and are designed to fit into the DS lite. A tiny bit of modding sees them fit perfectly into things with a full size GBA slot though (I am back on my original EZ4 now with either my SP or original DS but I used the lite for years and the lite deluxe for some time in one too).
The shop itself is very reliable (the used to sponsor GBAtemp even) so no worries there.