You might want to take a look at the KO PROPO scoring system. It's about half the cost of an AMB (although I haven't looked lately). I researched timing systems before I bought our AMBrc and the KO wasn't a bad option. The other thing you might consider is finding an older AMB 20 system. Perfectly usable and you should be able to get a good deal on one. Post an ad in the wanted section and keep your eyes open in the classifieds on rctech.