Work out your total wedding party before deciding who will pay. If paying for everyone doesn’t work within your budget, there are alternatives.
You could contribute towards each suit, cover the groom and best man, pay for accessories, ask adult groomsmen to cover their own hire, choose hire rather than purchasing or buy the groom’s suit while the wedding party hires.
Don’t look only at the price per suit. Ask for an approximate total for the entire wedding party, including all items and accidental damage insurance.