cmas shopping

well, i blew it!!! i said that i was going to stick to my limits and budget and lets just say that lasted all of......the first day of shopping! we have three children and i usually spend @ $200-$250 on each child. when you think about it that doesn't get you very far! like the year both of the girls wanted game boys. that was $100 on one gift and was well worth it b/c they took those things everywhere. this year they are getting one of the latest game systems and they want more of the electronic stuff... which aint cheap! i am not complaining about what they want just about my budget idea. it never last and i never stick to it. so why do i set one for myself? now, don't get me wrong, i don't go waaaay over. i think i set a goal as a guide. so, that when i reach it i think, okay, do they reallllly need this?
does anyone else run into the same problem?