Nuts & Bolts have usually been good on price but they don't have (or didn't have and may have upped their game) the greatest reputation for communicating any problems. I just avoid them now having had a good few items taking weeks to come and seeing others in a Festool FB group having similar episodes.
FFX are usually good on price and delivery. Their eBay store regularly takes part in eBays 15% discount events. They do bump their prices up compared to their own site for these events so you're not really getting a full 15% off - but it still comes out a bit cheaper.
Axminster have priced themselves out of my Festool radar as you can nearly always find somewhere cheaper. Previously, they were competitively priced and service was tip-top; I've not bought anything from them recently so, hopefully, that hasn't changed.
Toucan Tools (as mentioned above) and Healy's Tools (now "
Edisons") have been great all round.
The Evil Empire (Amazon) are good for occasional clearance / discounted items. If there's something you're wanting [just not tomorrow] pointing a price monitoring service like
Keepa or
CamelCamelCamel at the item in question can yield a hefty saving. They'll usually have a price history where you can see if / when the item was discounted and you can ask to be notified when it reaches your target price. This works well for Wera gear too especially their wallet-bothering larger tool sets.