Any idea what a map like this is worth?

Mythical rigid magteau map
Level Req: 20
Use Item to Receive Effect

+3 Warm Lights
+9 Evil Presences
+3 Rooms
+1% to 13% Item Drops
Quantity: 2

Depends on buyer, there is only 1 player that wants magteau maps' thus may pay more, you can find thread in the ISO section of trades.

Personal opinion, so don't take it as law.

You have Quantity of 2 maps, so 150 each map = 300 fg.

Remember, depends on buyer.