Hi there! There are a good few out there, but yeah sugarshack, almond art, and another favorite of mine is surbitonsugarart! They've always been good with fast delivery etc! I am based in Paris and I wanted to place a big order from sugarshack as they had great prices.... But then were going to charge me almost same amount of my order to deliver!!!! Surbitonsugarart had very slightly higher price but delivery far more reasonable! Of course it differs when you are in uk, but even when have big orders including cake boards etc it might make a difference? Also, depending on where you live, you may find a good store nearby! So you end up saving on that cost and can browse the store to your hearts delight! If you're anything like me though.... That might end up being more costly! Hahahha! I always get so tempted!
Good luck and if I think of any others I will let you know!