Ron,
If anyone would prefer to have their stuff shipped by the more expensive flat-rate box, I'll be happy to do so. I was merely trying to save people a few bucks. I'm sure I can scrounge up enough old newspapers and the like to stuff into the boxes between now and then to help take up any excess space. Of course, if the kits aren't shipped in boxes, then that makes things more interesting. Regardless, I updated the 3:15PM post from today to reflect the ability to ship using the larger size boxes.
Oh, I should note that it was not my intention to merely "stuff the kits into a flat-rate envelope. Now that I have some idea of how many VCR-tape size boxes I'll need, I'll start raiding the local post offices so I can use those inside the flat rate envelopes. I wouldn't want any of my kits, let alone kits of this price, shipped inside a plain flat-rate envelope! Sorry for any confusion!
The thing I was trying to avoid was shipping by a bunch of different services, or having to deal with order-specific shipping charges. For example, some of the priority mail shipments may actually be cheaper than the $8.10 (plus PayPal fees), and I just don't want to try to get everyone an exact shipping quote.