I have brand new, vacuum sealed packs of GHS "Boomers" strings for $7.50 per set (9-42, 9-46, 10-46, and 11-50 guages). Individual strings are $1.50 each. Guages 009, 010, and 011 available.
GHS Bass Boomers are $25 for a 4 string set (regular 45-105 guage only), again brand new sets in vacuum sealed packs.
I'm located in Beckenham.
ph: 0433 100 382