I have a brand new Gossamer Gear SpinnTwinn tarp that has never even been outdoors. I did install the guylines per GG directions, but I have not seam sealed it. Extra, short guylines of Bozeman Mountain Works AirCorePro added to the loops used only for extra stormy conditions.
I had planned to use the SpinnTwin outside of bug season but ended up purchasing a ZPacks Hexamid Twin.
Price $155 (Paypal personal) includes shipping to the lower 48. This tarp is brand new and currently out of stock at GG. First PM gets it pending receipt of payment.