Chris,
Welome to the forum.
I see your average number of colonies is zero? Grammar may not be my strongest point but......you had 'colonies' and lost 'one' which you want to replace? Or did you lose them all and want to replace just one of them?
Tell us more and we may be able to help.
At the moment my advice is split one of the others, or make up a nuc from them after inducing supercedure cells.......if you still have some bees.
Are you a member of the Northhampton BKA, or another in the county? They may be able to advise.
Have you considered bait hives? Coming up for swarm season.
There are nuc/package suppliers on the net. May have to wait a while but it is an option.
Regards, RAB