Drainage - Perforated Drain Pipe
Available in 10 foot lengths for about $10:
http://www.lowes.com/pd_187408-124-04550010H___?productId=3523674&pl=1&Ntt=4%22+drain+pipe $9.51 Buy 10, Get 10% Off ($8.56). Then 5% on Lowes card ($8.13). Then get HomeDepot to price match with 10% ($7.32)
http://www.dunnlumber.com/Store/ProductDetail.aspx?pg=0&pid=18524
A better pipe is PVC with holes but it costs a $1 more.