USA
100 pack of 1mL syringes:
https://www.amazon.com/1ml-Syringe-Sterile-Luer-Slip/dp/B07BQDRDC2/
100 pack of 1 inch 25g injection needles:
https://www.amazon.com/SHAOTONG-Luer-Lock-Accessories-100Pcs-25G-Long/dp/B09XPTJMF8/
100 pack of 1.5 inch 18g DRAWING needles (don't inject with these!):
https://www.amazon.com/SHAOTONG-Dispensing-Industrial-Accessories-Individually/dp/B081L5X6KF/
200 pack of alcohol prep pads:
https://www.amazon.com/Dynarex-Alcohol-Prep-Sterile-Medium/dp/B005BFL0RQ/
Canada
200 pack of 1mL syringes:
https://lifesupply.ca/bd-309659-slip-tip-sterile-plastic-syringe-1cc-bx-200/
100 pack of 1.5 inch 18g needles for drawing out liquid:
https://lifesupply.ca/terumo-nn-1838r-hypodermic-needle-18g-1-20mm-x-1-5-rb-translucent-clear-hub-bx-100/
100 pack of 1 inch 25g needles for injecting:
https://lifesupply.ca/bd-305125-precisionglide-sterile-conventional-needle-blue-regular-wall-25g-x-25mm-1-100-bx/
200 pack of alcohol prep pads for sanitizing top of your vial/injection site:
https://lifesupply.ca/bd-326910-alcohol-swab-bx-100/
Optional: 50 pack of bandages:
https://lifesupply.ca/amg-018-600-medpro-sterilized-adhesive-plastic-bandages-3-4-x-3-100-bx/
Australia
100 pack of 1mL syringes (either link is fine):
https://www.medshop.com.au/products/bd-syringes
https://www.medshop.com.au/products/terumo-hypodermic-syringe
(choose 1mL luer lock or luer slip syringes)
100 pack of 1.5 inch 18g needles for drawing out liquid:
https://www.medshop.com.au/products/terumo-agani-hypodermic-needle?variant=30252754632802
100 pack of 1 inch 25g needles for injecting:
https://www.medshop.com.au/products/terumo-agani-hypodermic-needle?variant=30252755189858
200 pack of alcohol prep pads for sanitizing top of your vial/injection site:
https://www.medshop.com.au/products/sentry-alcohol-swabs
Optional: 50 pack of bandages:
https://www.medshop.com.au/products/bsn-medical-coverplast-standard
UK
100 pack of 1mL syringes:
https://www.exchangesupplies.org/shopdisp_UX1L.php
100 pack of 1.5 inch 18g needles for drawing out liquid:
https://www.exchangesupplies.org/shopdisp_pink_drawing_up_needle_40mm_sharp.php
100 pack of 1 inch 25g needles for injecting:
https://www.exchangesupplies.org/shopdisp_orange_total_dose_25mm_low_dead_space_needle.php
100 pack of alcohol prep pads for sanitizing top of your vial/injection site:
https://www.exchangesupplies.org/shopdisp_pre_injection_alcohol_swabs.php
Bandages can be found at any pharmacy/grocery store and many online stores like Amazon (optional):
https://www.amazon.co.uk/Band-Aid-Comfort-Flex-Adhesive-Bandages-Plastic-60Ct-Family/dp/B005N4PAOY/ (60 count)
Sweden
100 pack of 1mL luer slip syringes:
https://www.med24.se/sjukskoeterskeartiklar/sprutor/kd-ject-iii-spruta-3-k-1ml-ls-centrisk-grad-0-01ml-100-st
100 pack of 1.5 inch 18g needles for drawing out liquid:
https://www.med24.se/sjukskoeterskeartiklar/kanyler/kd-fine-kanyler-ll-18g-x-1-1-20x40-mm-rosa-100-st
100 pack of 1 inch 25g needles for injecting:
https://www.med24.se/sjukskoeterskeartiklar/kanyler/kd-fine-kanyler-25g-x-1-0-50x25mm-orange-100-st
France
You can reach out to https://safe.asso.fr/index.php/rdr-a-distance for help with finding supplies. This service was established for harm reduction by providing safe and sterile drug use equipment, but their services overlap with HRT injections - meaning they will provide supplies free of charge.
Reach out at contact@safe.asso.fr or 01 4009 0445