Questions about gardening

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Hi:
Before stopping by at Mahoney’s ( We go there every time)
I have some questions:
1) Do you have peat-moss and if so, how big are the bags and how much does it sell for?
2)I need organic grade compost for vegetable beds. Total area: 50 square feet (Compost layer should be about 1 Inch thick) How much compost would I need for this, and what are the costs?
3)I need compost for flower beds (does not need to be organic if regular is cheaper than organic) Total area: 150 square feet (Compost layer should be about 1 Inch thick) How much compost would I need for this, and what are the costs?
4) Do you have soil testing kits and how much do they cost?
5) I need a Root Barrier for Bee Balm. What kind of material should I buy and use and how deep under the roots should I go?
6) How much is your “Professional Potting Mix?”

I’ll await your advice.
Thanks so much
 Frans