I've got a black on on order from them - looking October Delivery - but I'm patient, it will be great to protect things under the hood (bonnet) from the heat generated.Don't know if you are still looking into ways of doing this, or have sourced elswhere, but I have found TurboZentrum selling PTP blankets in the UK, £129.58 inc VAT (and a free keyring!) + £7.50 shipping
Their website currently says "Stock : not in stock - Delivery status : will be reordered for you", but when you add to basket it says 2-4 weeks delivery...
I guess they are buying them in from the US, but maybe in bulk with other items, lowering the cost of shipping / customs?
I have not pushed the order button yet, waiting for payday to roll around !
Link here - Fiat 124 Spider Black Turbo Blanket, £ 129.58
I decided on black as it will blend in with the OEM strut brace, airbox etc.