How much would your products be to send to uk as I know a few people might be interested in this and maybe also partnering up on your affiliate section too
It will depend, first class which can take forever, $25
Priority is $45 6-10 days
express is $53 3-5 days
I think unless you target American's you would have to buy in bulk at a cheaper price, shipping one at a time would not be cost effective.
shipping at $25 for such small item and weight is too expensive and over priced I would look at looking at INT shipping with other places as something like this from another hop that would last for 3 to 4 months they provide shipping at $10 or if buying even more will give free shipping world wide.
Maybe get something like business postage setup where you can ship in bulk a lot less as you pay for the service and you just get billed at end of month