Shimano has a number of interesting new additions which all fall into the “affordable” category. For the gravel crowd, the WH-RS370-TL is a multi-surface wheelset with a 19mm internal width meant for tubeless and non-tubeless tires from 28-38mm wide. Compatible with 10 and 11 speed cassettes, the wheels are 12mm thru axle compatible, disc brake only, and sell for $254.99 a set.
https://www.bikerumor.com/2018/03/08/shimano-alivio-acera-altus-get-trickle-down-tech-affordable-wheel-options-expand/