While I'm not a huge fan of cheaper than dirt, they do have this for $150, comes with 3 choke tubes I think;
https://www.cheaperthandirt.com/pro...t-rib-barrel-blued-bead-sight-015813901406.do
https://www.cheaperthandirt.com/pro...t-rib-barrel-blued-bead-sight-015813901406.do