Just a "heads-up" for any UK readers with an Aldi store near them: I went into our local Aldi yesterday evening, and they have a double-pack of HDMI cables for under £3 (I didn't note the exact price, but it was something like £2.49).
The cables come in a "blister pack" - looking like the sort of item you'd find in a major electronics chain-store for many times more - and didn't look cheap (as the "pound-shop" AV cables often do). I'm not sure if this is one of their "here today, gone tomorrow" offers, so I might just snap one up while it's available - I thought this might be of interest to new RasPi owners
The same Aldi store is also currently selling a 3-in, 1-out HDMI switch for about £14 (I really should have noted the exact prices ). Whilst you can often find these devices on Amazon for less - about £7-8 in my experience - you'd probably pay far more in one of the aforementioned high-street stores for an HDMI switch, so the Aldi one might be worth a look if you don't fancy a punt on Amazon (for whatever reason).