dont bother sending in for the PDA.. its really not worth it.. you'd get frustrated trying to *understand* how it works. you wont ever use it.. lol it sux that much. only get if if you plan on giving it away to someone you hate . maybe they will get you something nice thinking u actually spent money on them, although your gift (the pda) was a piece of junk
the cd player is pretty nice goes for about $20 on the web. its by JWIN model #JX-CD285. prolly will make a good xmas gift
as for sending all postcards at once.. it shouldnt be a problem.. i was too lazy to mail them seperately. so i mailed them all at once.. so far i've received the cd player, pda, and georgeforeman grill.