A cheap alternative to the hundred$ commercial slide boards, also lightweight and compact compared to the other DIY ones Ive seen. Not just for sliding back and forth to sim speed skating but there are a lot of other exercises can hit almost every body part, I wont post vids but YouTube will show you plenty without having to look at my ugly mug.
Materials: -Vinyl Deck Flashing- You'll probably have to order this online or from your hardware store. $20 for a 20' roll of DuraFlash -1x4" board -car wax -non slip tape or non slip rubber -screws -spray adhesive -saw, razor and screwdriver -socks or polar fleece booties
I was lucky and only had to by the vinyl flashing but the total cost should be under $40.