Alright, lets try this again. See OP for Cat details.
TL;DR - I'll swap with US-based forumites with more than 100 posts. Sorry lurkers are not invited.
Cat 1&2)
eTrex GPS (no maps, simple, check points, find your way back, water resistant, legend has it that you can run it through a laundry cycle, software is borked and timestamps no longer work, so no longer good for yacht racing, but still good for navigating)
VGA-VGA cable (two), Displayport-Displayport cable, RCA A/V cable (fancy looking, gold plated), also other cables, too many to list. Just ask.
Kindle 3G keyword (white) + blue cover (depreciated by amazon, battery down to 1 day’s worth)
ASUS Eee laptop (from 2009ish. Linux project?)
iPhone 5S (freebie, barely functional as far as I know. Maybe you can make something out of it?)
Compost worms (red wigglers, local pickup only!)
Various watch batteries (button battery for watches, calculators, ...) (local pickup only!)
More watch stuff: Spring bars to attach straps to watches for NATO conversions.
Most bicycle parts #lowend (gear and brake cables, inner tubes, cable housing, bar wrap, cogs, cassettes, bar plugs, handles, cable ends, ferrules, …)
Used circular saw blades (for knife making)
fishing lures (mostly hooks and softbaits)
random yarn (DW has an enormous collection, so ask)
AAII journals (2022)
Random hobby-sized brass tubing (be very specific and I might have it, e.g. 2” of 5/32 ID)
Patreon stuff: HTME stickers / Stuart McMillan postcards
Boxes, packing material, padded envelopes (local only, it makes little sense to mail this)
Various smartphone/computer disassembly tools (small screwdrivers, pry bars)
Gear wheels made out of plywood (I make clocks. These are surplus parts. Artsy projects?)
Cat W)
MOLLE adapters (“90 degree” in particular!)
TapoutXT2, P90X3, et al. (DVD workouts)
Protoboards, various electronic components (resistors, capacitors, transistors, test leads,...)
Arduino, Raspberry Pi stuff
Wooden dowels (clean, any diameter)
Metal rods (brass, steel, not rusted, <1”dia.)
Lead (pellets, cylinders, blocks... ) (I use them as clock ballast)
Heirloom seeds. (Especially high SHU chili seeds
)
Morale patches (2”x3” w velcro)
Camping knife
Enough to fill a flat rate mail exchange.