Bargain omnibuses @ $4.99 from Harlequin's Mira imprint (the one they use for non-romance-dedicated other genre titles) in Canada & the US (should be the same price at all the usual retailers):
You can get points on these shopping in any store if you join the free
Harlequin MyRewards program (
FAQ; if you join through an existing member's referral link, they get 500 bonus points and maybe there are some MR Romance forum-goers who haven't used up all their allowed referrals yet) and submit your receipts.
IIRC, the amount of points you'd get from buying at least one of these plus the bonus points you get from just joining up and filling out some getting-started surveys should be enough for at least 1 free ebook worth up to $8.99 in the Harlequin store (which also sells some fantasy from Mercedes Lackey and adventure thrillers like the Don Pendleton Mack Bolan Executioner franchise, etc., in their non-HQN lines).