T-Mobile is dropping its on-contract pricing for the Nexus 4 all the way down to $49.99 for the next 10 days. In conjunction with an online-only discount the latest Google handset can be yours, provided you're willing to sign up for 2 years on a Classic Plan, for $150 off what it was sold for previously. This still involves a $50 mail-in rebate (please, stop that) but even that's worth the hassle at this price. We're not sure what the motivation is here from T-Mobile's point of view, but we're not complaining.
Although we still strongly consider you look into buying the Nexus 4 full price from Google Play and heading to T-Mobile with a Value Plan or prepaid option, if you're stuck buying phones subsidized on contract (such as in a Family Plan situation), there probably won't be any better time than now to pull the trigger on this device.