Monologue help; little lengthy but all advice appreciated!

Five Women Wearing the Same Dress is jam packed with awesome monologues. It's also very easy to piece together monologues.
The Children's Hour and Bus Stop also have a few that i've used before.

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you can't use the Phillanderer for a modern monologue - GBS's style of writing is far too old fashioned.

classical monologues are easier to find - get yourself a complete works of shakespeare and flick through it (it will take forever tho). Also you will probably want some 17/18th century stuff - it's always good to cover all of your bases (Google the period of theatre that you want stuff from, get the writer names and start searching from there).

for modern, check out Abi Morgan, Sam Shephard, Tom Stoppard, David Rabe.

A good idea is if you ever take a trip to london, ALWAYS pay a trip to the royal court theatre (next to Sloan Square tube) they have an awsome bookshop downstairs. Also pay a trip to frenches book shop (warren st??? - round there somewhere - again you can google it)
It's harder to find stuff if you aren't in a big city. Foyles, borders and waterstones also have a fair amount of plays in.
I quite like spending the day in a bookshop flicking through anything that grabs my eye. Random and fun, lol.

also look at monologue books and for each one you like, take note of the writer and find other plays they have written.

Good luck dude xx