i don't think he wants to test or lab something than rather have a slide in his presentation with: cisco mpls-enabled router 6000$, juniper mpls-enabled router 4500 $, mikrotik mpls-enabled router 1000$
so more a comparison of prices, not really of performance.
otherwise he would not ask for the "cheapest", as the next MUM is just around the corner and i don't think he will buy and of course pay them before that
@normis: you asked for prices of cisco and junipers, i got you juniper ones and cisco is around 2500 for the smallest one, which should be a 2800 (like even a 2801). what else are you looking for? these are real street prizes, i think with the right partner status you might get a bit more rebate, but only in a small percentage.
are you looking for prices of the really big irons? when we are talking about 76xx, asr9k or crs-1 i don't think anybody here can give you a quote, and even if it would be waaaaaaay over 20k-30k except the 76xx, which might be at around 10k.
if you are looking for middle-sized boxes the 73xx or the cat65xx is used very often in an mpls-config here in germany, the 73xx is around 10k in a standard-config and is being sold atm, the 65xx is a cheapo and not really recommended and can be bought at around 2-3k here.