Three things to know about my bricks;
1 - My bricks are all "NEW". They come from sealed sets or the pick-a-brick wall.
2 - Sets are purchased from major retailers - not ebay or yard sales.
3 - The bricks are stored inside my home which is both smoke and pet free. (Except for two goldfish, however, they aren't allowed to touch the legos or to smoke inside the house)
My shipping calculation for domestic US orders less than 15 oz (23 March 2021)
USPS First Class shipping in a bubble envelope.
0.00 - 4.00 oz = $ 3.89
4.01 - 8.00 oz = $ 4.25
8.01 - 12.00 oz = $ 5.08
12.01 - 14.99 oz = $ 6.38
For larger orders you will have to request a quote.
The options are usually
USPS Priority Mail bubble mailer = $8.00
If I can't fit it in there then we have to go with Priority Mail Regional Rate A or B box.