The cheapest Rittenhouse whisky is Rittenhouse Rye ‘Bottled in Bond’ 100 Proof (50% ABV, 70cl), at £35.90 from Master of Malt. That is £40.85 delivered to the UK mainland for one bottle.
What makes a whiskey a rye?
In the US, rye whiskey must be made from a mash of at least 51% rye, distilled at no more than 160 proof and aged in charred new oak barrels entered at no more than 125 proof. Straight rye must be aged for at least 2 years and may not contain colouring or flavouring.