Thanks, buds, for all your words. 
I think you should contribute whatever you want to, from $5 on up. If there is money left, we can donate it to a good cause in Heath's memory.
Just a though here. What if we take the extra monies and set up a scholarship fund in Heath's name at a Performing Arts school? So when his B-day rolls around we can contribute more into the fund.
On this other fan based site for a Canadian actor ,in lieu of cards and gifts,we have been doing this for several years and the actor, school, and student is very appreciative of the gesture.