Members who post "WTB" ads - especially for high value items are reminded that this thread is public and can be read by anyone.
A common scam is to get contacted by a seller who has what you want, who sends you pictures and who then asks you to pay with one of the less mainstream payment apps. Like VENMO or similar.
You pay, the item "ships" - it never shows up and your cash has gone.
This is a common scam - especially with Avionics.
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Buyer Beware and insist on using a payment system like PayPal, a Credit Card or Escrow. Where you get protection. If sellers are unwilling to use these services - this is a RED FLAG.