Bermuda Base Metal Proof Set 1986

Hi, I can't seem to find many Bermuda Base metal proof sets online for sale. Does anyone have any idea how much a 1986 proof set is worth? Would it be worth it to buy one for around less than $40 USD?

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https://www.ebay.co.uk/itm/306229755956 

Bermuda 1986 British Royal Mint 7 Coins Proof Set 

Leather Red Case +COA 2500 Set
US $179.99
Approximately £136.60
“Full issue mint COA, Red Leather Case as pictured”