I have been looking at ebay and have come across multiple/many different full skeletons like this one:

https://www.ebay.com/itm/355909781511

https://www.ebay.com/itm/355960517733?_trkparms=amclksrc%3DITM%26aid%3D1110013%26algo%3DHOMESPLICE.SIMRXI%26ao%3D1%26asc%3D277105%26meid%3D2d3fe0353bf74d5c951bc4e6b10ae2a5%26pid%3D101196%26rk%3D5%26rkt%3D12%26sd%3D355909781511%26itm%3D355960517733%26pmt%3D1%26noa%3D0%26pg%3D2332490%26algv%3DSimRXIVINativeV2WithSellersOwnItemsFilter&_trksid=p2332490.c101196.m2219&itmprp=cksum%3A3559605177332d3fe0353bf74d5c951bc4e6b10ae2a5%7Cenc%3AAQAJAAABEMd7r5mNjkO12hUFN8%252BUjou0r36TWdG4ts9ki5yV37PLn%252BNOULI4btYgHvyZLxyhY3Bk8UU9wz7m6oNPloQX1TfGLLpPiEvw%252FDG%252F6f4ObSpmLqK57dEPr23xWj9X%252FN%252BQVhn33i%252FcnPSG0Hhewo0%252BHD8Lxr3aREoO8EZOuZ7PTwYm2DRqGpvebTbjiCSs5Xawfs7VDJMMul14TtnEdpARRExpCG1L7qUk1kn17PjetsaZ8lgOQ%252BJB50j3p26%252Bw6oZtbjZyRdrCyWJ2nxRYtn81ZuAg5bT9YHi6uIHxL8%252B3BQbnPr4GqSX5bAsjyQ8m5M2bwpFahWo1h2O%252Fo2lMjXwNM80V9eaDDv40P2izaQ%252B5uFr%7Campid%3APL_CLK%7Cclp%3A2332490&itmmeta=01JDW9XRBAXYW17VTWR5ETW3CN

I understand these are re-constructed from bones found nearby one another and have matrix to hold it together/shape it, but is it a scam entirely or do these "fossils" actually ship and arrive as they appear in the photos?

https://www.etsy.com/it/listing/1783528065/teschio-di-mosasauro-da-27-di-grande?gpla=1&gao=1&&utm_source=google&utm_medium=cpc&utm_campaign=shopping_it_it_it_-craft_supplies_and_tools&utm_custom1=_k_Cj0KCQiAo5u6BhDJARIsAAVoDWsErUiz_qfxnUIceAyFozIIB5SDF7_KwhKuGuWgiPDZRXOdGSVLeUMaArYbEALw_wcB_k_&utm_content=go_21711271088_167738767899_713819064654_pla-295462056867_m__1783528065itit_5416284652&utm_custom2=21711271088&gad_source=1&gclid=Cj0KCQiAo5u6BhDJARIsAAVoDWsErUiz_qfxnUIceAyFozIIB5SDF7_KwhKuGuWgiPDZRXOdGSVLeUMaArYbEALw_wcB

I've seen these pieces sold for 10 eur and bought one for for even less. I know they are common but I didn't think they were that much.

https://preview.redd.it/k7pl1c95me3e1.jpg?width=1468&format=pjpg&auto=webp&s=bd2107e2fd4412197ce5112c5f28758f4b7b340c

Don't want to get scammed, every small detail would be nice to know

Saw this "shark jaw" about a year ago at the Mineral show in Hamburg - Schnelsen, Germany.