Well it is now pretty much buy 2 get 1 free :-) Which I would go for, I'd even forgo the 0.002 you'd make. Put it towards the beer you'll undoubtedly need.

2*0.1 = 0.2
3*0.066  = 0.198

1BTC @650USD = 1.3usd left over (0.02).

It will probably stop you having to mess around with refunds and resubmissions.

mark