LynkyoExpress via Amazon offers the A-DATA 32GB microSDHC Class 4 Secure Digital High-Capacity Card, model no. AUSDH32GCL4-RA1, for $17.47 with $2.50 for shipping ($0.62/GB). That ties an April mention as the lowest no-rebate price we've seen for a 32GB microSDHC Class 4 card. Outside of the prices below, it's also a current price low by $4. It includes a full-size SD card adapter.

Close prices are at SupermediaStore for $19.99 via coupon code "OBBD7" with free shipping, and TigerDirect for $19.99 with free shipping.