Some tips on mailing from my experience. If you are in the USA, try to use to Priority Mail. Its real quick and relatively inexpensive. $3.50 1-2 tapes, $3.95 3-4 tapes, $5.20 5-7 tapes, $7.20 8-10 tapes. Usually gets there in 2-3 days anywhere within the USA. Normal shipping is about half the price, but takes 1-2 weeks sometimes longer. The longer they have it, the greater the chance that they'll lose it.
But here's the best part. The priority mail boxes are free. You just have to ask for them at the post office. I used to ask for 5 every time I was running low. Now though I order straight through the USPS web site. They will send you boxes free in multiples of 25. All you have to do is sign a waver saying thats the only thing you'll use the boxes for, mail that is. Oh yeah, make sure their the Priority Mail box, not the Express Mail boxes.
So if you send normal shipping and have to buy the box, its basically the same price as Priority, with alot less wait time. Just trying to help.