The (apparent; though I have been given references of prices lower today than pre-pandemic in some instances) price increase for hCG is a result of unintended consequences from hCG compounding restrictions that have been implemented at the federal level in the U.S.
US federal regulators have prohibited compounding (i.e., urine-derived) hCG to target off-label uses that include principally TRT maintenance (of testis function & size) and "anti-aging" applications (rife with fraudulent & deceptive marketing tactics with respect to hCG's effects).
So, while it is still legal to prescribe it for these off-label uses federally in the US, patients and their doctors have to rely on manufactured, i.e., imported, (recombinant; r-) hCG, that due to supply & demand (because demand is outstripping current supplies) has become, apparently, exorbitantly expensive. This, unfortunately, affects the entire market including those who would acquire it in its manufactured form without prescription.
Some compounding pharmacies (with previously high volume hCG sales) are now going through the FDA licensure procedures (Biologic License Application; BLA) for the ability to resume lucrative hCG sales.
And the incentive isn't there for doctors, who can't make money slingin' it out of the compounding pharmacy in which they hold a financial stake in sales profits, to prescribe it under these conditions. So, in practice, they're, in general, going back to Clomid (clomiphene) for now.
To your question of whether there are any alteratives for maintaining testis size: hMG will to an extent, as it generally contains LH & FSH; but in some instances, only FSH or an analogue thereof. It'll be more expensive than hCG, though. HCG does more than maintain testis size, anyway, it stimulates the Leydig cell of the testis, promoting or permitting in some instances (i.e., doses up to 200 mg testosterone q.w.) steroidogenesis (i.e., maintained intra-testicular testosterone synthesis).