Maybe not quite as big as them stocking the new TTDS, but DealExtreme is now stocking the 512M/64MB ELink GBA flashcart for just $21.80(4x the memory of their other cart for barely 2x the price!). Remember to read GBATemp's review before jumping on it, as it does seem to have its share of cons.
Sinkhead Edit: Changed title as requested
Sinkhead Edit: Changed title as requested