Meritline.com has a great deal on the Kingston 4GB MicroSDHC memory card which was already at $22.11 – 10% off = $19.90. That is the cheapest MicroSDHC card I have seen to date. For comparison the same card goes on Newegg for 47.99+ $5 shipping. Keep in mind that this is a SDHC card so I think that means it only works in the 8300/8310/8320 Curve, 8830, and 8820. I cannot promise that it will be compatible but I purchased one myself to try it out since I think they do work. These cards were going for $99 just a month or so ago.
Link to card: http://www.meritline.com/kingston-4gb-microsd-transflash-memory-card.html
Discount code for 10% off: sw10poff
Discount code expires tomorrow!