How do you send your Kodachrome to Dwayne's?

[erikhaugsby]

Do you use a bubble envelope? A small box? Something entirely different?

I'm debating whether to send my roll (only one) (1) directly to Dwayne's, (2) send it through my local photo store, (3) or use WalMart. Unfortunately, each option has it's own set of problems:
1. Dwayne's is bloody expensive! $8.50 for developing plus $5 for shipping the chromes plus $? for shipping the roll to them.
2. The photo store is slightly less expensive than Dwayne's Direct ($10 flat), but it'll take up to 2 weeks to get my chromes back.
3. WalMart is cheap ($4.88), but again I'm faced with the possibility of somebody misfiling my film and processing it C-41 (or am I just worrying too much about this?) and the wait for them to send it out and get it back.

So, what say ye? Are there any options that I'm overlooking?