If you have to purchase and can't find used material to use. Then use tops and limbs and sink them. When you find a pile that produces really well then spend the money on the pvc and make the spot permanent. Drop the pvc condos in after the brush rots away or when what you feel is the brushpiles last year of productivity ( and you'll be able to tell by your catch rate declining) giving the pvc some time for algae growth and for the last few limbs to rot away so the hang ups become fewer and fewer. This way you won't waste your pvc on a bad spot. CF
The Original Woodsgoat Hater
2011 NWR Bash Yellow Perch Champion