I don't know how much homebrewing you do. I buy resistors in bulk, usually as a representative sample of values. This is very cheap per resistor but more to the point, it is always there in the junkbox and you can play around with various values when homebrewing.
Mind you, I used to buy this sort of thing at Radio Shack or my local independent electronics component store (as recently as four years ago, before I left America; I'm now in England). So no shipping charge, and the Radio Shack store was right opposite the Trader Joe's where I shopped for food, so there was no extra driving cost. Even today, I see that Radio Shack still exists and is selling a set of 50 1/4W resistors for $4.99 ... but with a huge additional shipping charge.
The other issue is that one of your requested resistors is 49.9K, which in my experience is an unusual value. Unless you really need a precision resistor (are you building a multimeter?), you can probably manage fine with a standard 47K resistor.
73 de Martin, KB1WSY (for now)