Cheapest I have seen for the RAC630 model - Same price either from Amazon or via 7 Day Shop (on Amazon) cheaper than 7 Day Shop directly which has it for £18.99
The RAC600 might be elsewhere a bit cheaper but the RAC630 seems to get better reviews.
This digital compressor can inflate a fully deflated car tyre in under 3 minutes. It has an air flow rate of 28-30L/Min. Built in white light for direction and red light for alert/SOS. Fitted with a fused 12v power plug and 3.2m power cord (approx). Flexible air hose 53cm(approx) with screw stem connector.Deflation valveSeparate pump and light switches. CE approved
(Note: this deal is not expired, did that earlier by mistake apols!)