I just bought this one a couple weeks ago and it arrived ahead of schedule: Flexispot Electric Standing Desk Height Adjustable Desk, 48 x 30 Inches Sit Stand Desk Home Office Workstation Stand up Desk (White Frame + 48 in White Top) https://www.amazon.com/dp/B07W42DSG8/ref=cm_sw_r_cp_api_glt_fabc_YTCBV67VTBSFPK0CB2WZ?_encoding=UTF8&psc=1

$250 and it is working great so far!

Amazon has

Furniwell Electric Standing Desk 40x24 for $135

Sweetcrispy Electric Standing Desk 40x24 for $136.41

Flexispot Electric Standing Desk 48x30 for $180 after the $20 off coupon. I know it’s more than your budget but figured I share in case you have some room in that budget.