Marriner Mercerized Cottons are a lovely silky soft DK knitting and crochet yarn made for 100% mercerized cotton at £2.95 per 100g ball.
You may purchase them direct from Amazon.co.uk in a nice range of colours.
"I also have the other colours - all of which are beautiful even after
boil washing. I use these colours to crochet - I've made a few
beach/pool cover-ups and other casual tops, but I mostly use this to
jazz up dishcloths, potholders, and table mats. All in, I'm very pleased
with the performance. I haven't tried knitting with this yarn but it
crochets easily enough (does split a bit so I do have to be careful to
really watch my stitching).
If washed at 40C, the colour stays bright for about five washings - even after five washings the colour is still pretty enough that I'm wearing the first top I made a few years ago (in violet) and hear compliments whenever I wear it. Washing at 90C fades the brightness at the first washing - but my dishcloths, etc, are hygienically clean and the colours, whilst faded, give my kitchen the retro-vintage-country look I like. BONUS - the colours don't run in the boil wash and potential stains wash out completely. When I used these colours the first time to crochet kitchen and table linens I expected some colour run but decided to give it a go and am very happy to report no colour run and just a little fading."
"As I have said many times before This wool is really good quality and knits lovely highly recommend. The price is so good."
"Excellent purchase. Service excellent from ordering to delivery. Quality of wool is excellent. Will certainly be back for more Many thanks. xx"
"Very nice quality cotton yarn, excellent colours with perfect dyeing. I've been crocheting with a 3.5mm hook, which feels comfortable."
"Beautiful to use, would buy again, very happy with the service."
" I bought this Marriner Mercerized Cotton yarn to make a shawl for my friend not knowing what to expect as I've never had it before and I was really surprised what a nice look."