|Never happened to me here in So. CA. Historically, I get small mail box size pkgs within 3-4 days from the east coast at a couple bucks USPS postage. On the other hand its 7-10 days by UPS at 2-3 times the cost. My references are PTOP in Ohio and Brettuns Village in Maine.
:Its funny that you mention UPS. I prefer UPS because the post office hasn't learned to spell yet. Their sorters only use the street numbers not the street names hence you may get someone elses mail with the same street number. I'll pay the couple extra bucks.
::I've always had good luck with both Mouser and Digikey. My only complaint is their policy of charging CA sales tax. I avoid unknown suppliers of dubious reputation, and most that only ship UPS vs USPS.
:::There are a ton of parts suppliers on the internet if you look. Digi-key is another large one, I think I will try them for a while.