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check craigslist for outdoor dog kennels, chainlink fencing, etc.
you don't have to have post hole diggers to set posts.....you CAN use a shovel, and tamp the dirt down around the posts as you back-fill.
Landscape timbers sometimes go on sale for $1-2/each and are treated/wolmanized for ground contact so you don't have to worry about them rotting out.
If you have a Menards near where you live, check there for fencing.....I was finding hardware cloth for $10 for a 2ft x 50ft roll all summer.