Here is a cheaper block of aluminum as requested. https://www.ebay.com/itm/1-X-4-ALUMINUM-6061-FLAT-BAR-7-long-1-00-x-4-0-Solid-T6511-New-Mill-Stock/282079673259?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649