the last ones were allocated either last year or the year before.
and re-allocations have been taking place.
for example people in the UK with orange broadband, (as I used to have) will frequently find themselves allocated a 2.x.x.x address an address that's supposed to be used in the US, reserved space. supposedly for nothing or US military.
now allocated to RIPE, the 1.x.x.x range is taken out of reserved for us mil and given to Asia pacific numbers authority.
if you want to buy a block of addresses now, you'd find yourself having to go to someone who owns addresses and trying to get theirs, as opposed to going to ainc or ripe etc and just requesting like you used to.