I was speaking to a middle aged employee in my local store about getting a Garmin GPS cycle computer. He told me that as of Wednesday 20th of August you will get a 15% off voucher with any purchase. Unsure if it is just for that day or the week. He went on to say this voucher could only be used in September, on 1 item, so if I didn't mind waiting then that would be my best option. I didn't check if this applies online as well as he only had sketchy details himself and whether there are any restrictions. I will be going there tomorrow to confirm this but he seemed convinced and I'll be updating to clarify the details but you've got the jist.
Combine this with the 10% off gift voucher deal (assuming thats still running) and by my calculations thats 23.5% off which aint bad.
This may be useful to someone who can wait until September for a big purchase.