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Just googled "Delrin bushes" and a vast multitude came up, so I'm sure you could get something the right size for under a fiver.
Also found a material I hadn't heard of before that sounds interesting with probably more choice of bush sizes.
igus® iglidur® FDA Bushes are available in a choice of 3 materials (iglidur® A180, A200, and A500). The bushes require no lubrication. The appropriate iglidur® material to select depends on application:
iglidur® A180 is suitable for general/waterproof use within environments where foodstuffs or drugs are present, and where low water absorption properties are required
iglidur® A200 is also suitable for foodstuff environments (in direct contact with food), where dirt needs to become embedded, and where low to medium load applications apply
iglidur® A500 is the choice of bush material to select where high temperature, chemical and high load resistance is required. iglidur® A500 bushes are also suitable for use within foodstuff environments, and offer good abrasion resistance.
Leading companies across the globe specify Delrin® acetal homopolymer from DuPont for high-load mechanical applications such as gears, safety restraints, door systems, conveyor belts, healthcare delivery devices, and other demanding products and parts. Delrin® acetal homopolymer (Polyoxymethylene POM) is the ideal material in parts designed to replace metal. It combines low-friction and high-wear resistance with the high strength and stiffness such applications require. It provides a wide operating temperature range (-40 °C to 120 °C) and good colorability. Delrin® also mates well with metals and other polymers and offers excellent dimensional stability in high precision molding.
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