I just bought these memory foam ballet flats from Next today and they are honestly the most comfortable shoes I've ever worn. I feel like I am walking around in slippers. I find most ballet style shoes difficult to wear because they fall off my feet but the elastic part on these helps. I'm considering going back and buying them in every colour (well maybe not the glittery version because I don't to glitter). Unfortunately some sizes are sold out online but they had loads on the shop floor.
Just thought I would share incase (encase? - sorry this is one grammar rule that has always confused me) anyone was looking for some inexpensive comfy flats.