Subscribe to the Newegg e-blast emails. I see 32GB class 4-6 cards for $15-17 shipped all the time. 32GB Class 10's $20-$22 shipped. Think I've seen a 64GB MicroSDXC once too. Wanna say ~$50.
In general, the new rule of thumb for a great deal is .50/GB. I've seen as low as .41/GB from Newegg for name-brand class 4 media. Gotta watch the e-blasts for coupon codes. I look through them every single day.
Current Phone: HTC EVO LTE -- LazyPanda S-OFF --
ROM: MeanROM ICS v2.2 Based on software 1.22.651.3
PRI/PRL: 2.45_003 & 25002
Recovery: TWRP 2.2.0