https://www.amazon.com/dp/B0040Q85L6/ref=cm_sw_r_cp_apa_fabc_lAdcGb6KGFX4G

This is the one I got.

My personal cockatiel wish-list:

Tops 25 lbs Pellets: https://topsparrotfood.com/products/tops-mini-pellets?variant=16280835162155

Yaheetech 54-inch Wrought Iron Cage: https://www.amazon.com/dp/B07MXSRL2Z?ref_=cm_sw_r_cp_ud_dp_TH9DCG57P6GDJT88ZATV

Gram Scale: https://www.amazon.com/dp/B09QFWXSD8?ref_=cm_sw_r_cp_ud_dp_6VMQSFK0BB11S5N76FWQ

Bird Stand (For Gram Scale/Stationing): https://www.amazon.com/dp/B08L66L5BZ?ref_=cm_sw_r_cp_ud_dp_ZNMMVANYWQSAQ75X99FD

Shower Perch: https://www.amazon.com/dp/B0040Q85L6?ref_=cm_sw_r_cp_ud_dp_9NTF334W9ME1GSPA70PS

BirdTricks Tiny Toy Box (8 Toys): https://birdtricksstore.com/collections/premium-parrot-toys/products/tiny-toy-box

Bird Harness: https://www.amazon.com/dp/B082XXF8LD?ref_=cm_sw_r_cp_ud_dp_YA1BT9ZTBJCKH3AEJ7Q2

Subtotal for all items: $361

Hand-Tamed Cockatiel: $200

Vet Emergency Budget: $500

Total: $1061

Conclusion: You have to be ready for these types of costs and you also need to study how to understand bird body language and how to train birds using permission based training.

Cockatiel Training 101: https://youtu.be/HRjsVO4zcmo

BirdTrick's Free Guides: https://birdtricksstore.com/collections/free-products

Good luck!