Here, these are some Defenders that make me cringe less than others: The best Defender creatures are ones that support our tribe (Axebane Guardian), interact with the board in a meaningful way (Junktroller), bring some needed utility to the deck (Mnemonic Wall), or are super efficient beaters with extra bells and whistles (Wall of Denial)
Cards like Genie, Power Unleashed will let you cast AWNW for free later in the game, while providing a body that can keep opposing characters in check
Every time I've used TCGplayer, my cards arrived in about a week in standard envelops
And they cant block you when you activate the Immobilizer Eldrazi, and thats a huge way to mess up with combat math
Not to mention is it only three mana, ideal for Sun Titan recursion
For public markets, we have sites like eBay or Goldin Auctions where current listings are publicly visible as well as a mechanism for searching sold prices as well