WS-X4624-SFP-E used in stock 24port 

Cisco Model WS-X4624-SFP-E
Product Description Cisco Line Card E-Series - Expansion module - Gigabit LAN - 24 ports - for P/N: WS-C4503-E-S2+48, WS-C4503-E-S2+48V, WS-C4507R-1S5-10GE, WS-C4507R-E-S2+96
Device Type Expansion module
Form Factor Plug-in module
Approximate Dimensions (WxDxH) 14.3 in x 10.7 in x 1.2 in
Ports Qty 24 ports
Data Link Protocol Gigabit LAN
Data Transfer Rate 1 Gbps
Connectivity Technology Wired
Features Port Aggregation Protocol (PAgP) support, Jumbo Frames support
Compliant Standards IEEE 802.3z, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3x, IEEE 802.3ad (LACP), IEEE 802.3at, IEEE 802.3az
Expansion Slot(s) 24 (total) / 24 (free) x SFP
Compatible Slots 1 x expansion slot
Compliant Standards NEBS level 3, CISPR 22 Class A, EN 60950, IEC950, UL 1950, VCCI Class A ITE, CSA 22.2 No. 950, EN55022 Class A, AS/NZS 3548, RoHS, EN55024 Class A
Designed For P/N: WS-C4503-E, WS-C4503-E-S2+48, WS-C4503-E-S2+48V, WS-C4506-E, WS-C4506-E=, WS-C4507R-1S5-10GE, WS-C4507R-E, WS-C4507R-E-S2+96, WS-C4510R-E