I purchased the very same things on Sunday and good old Eren Spot in Fethyie, this place was as competitive as I could find to be honest, the prices are all different depending on quality and choice! I paid 70 TL for a good quality lounger/sunbed with armrests, the ones without the armrests came in at 50 TL, once again sleepers are different prices but the good quality waterproof ones we decided on cost 25TL each, you can get them from 20TL though. Turning to the parasols, we paid 90 TL for ours, large one which was stripped, our choice and it included the white base.
Hope this helps.
Kevin