Building a jib set up - snowflex issues etc

I am Thinking about creating a summer (and when theres snow about) jib set up.

reckon i coulds build a rail/box anf in ramp fairly easy. however i am unsure of what to do when we dont have snow (every day) i could use snoflex buts is very expensive.

Has anyone done this or have any good ideas.????

ive been thinking:
astroturf
cheap versions of dry sliope but unsure of where toi get them
ringing dryslopes and asking for cut offs

all replies appreiciated