New England style Adirondack plastic chairs?

[milkyman]

www.amazon.co.uk/gp/aw/d/B00X5KBISK/ref=mp_s_a_1_5?qid=1459499145&sr=8-5&pi=AC_SX236_SY340_FMwebp_QL65&keywords=adirondack+chairs&dpPl=1&dpID=41FtLIqGU5L&ref=plSrch

I am after something like this - does anyone know where i can pick up cheapish plastic chairs like this?

Do they have to be plastic? How cheap is cheapish?
I have seen folding ones in Next, in natural acacia, or dove grey.

Just to say that though comfy to sit on, they are hard to get up out of