All I will say is that you cannot go wrong with Bliffert. Forget about the big box stores for lumber. Best selection and service bar none.
Since lumber is a commodity...prices change constantly. May I suggest you call and get the current pricing. I believe in 2x10 all they carry is hem fir or doug fir...possibly some spf. Standard construction grade lumber will have some knots in since it is usually #2 grade...but it should not be excessive. If need clear stock you may need to special order it.
I would say prices are comparable to big box but better quality
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